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Bedrock Geology

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Coal River

| SW McQuesten | Whitehorse Trough | Eastern Laberge and adjacent Quiet Lake | SW Glenlyon | Coal River | Coast Belt | Finlayson Lake | Kluane Ranges | Windy-McKinley |

Regional geology mapping of the Coal River map area (95D) was undertaken in 2009-2010 as a collaborative project between the Yukon Geological Survey and the Geological Survey of Canada. Southeast Yukon is under-explored although it is geographically situated at the south margin of Selwyn basin and the southeast tail of the Tintina gold belt.

The Coal River map area is underlain primarily by a 14000+ m thick sequence of miogeoclinal sedimentary and minor volcanic rocks that range in age from late Proterozoic through Triassic. The sedimentary rocks demarcate the northern margin of the Lower Paleozoic Macdonald carbonate platform transitioning to the marine shale Selwyn basin. Upper Eocene coal-bearing, fine-grained fluvial and lacustrine deposits occur locally in the Rock River basin.

It offers potential for sediment-hosted base metal and intrusion-related base and precious metal mineralization. Sediment-hosted mineralization may include both sedimentary exhalative Zn-P±Ba deposits in black shale (SEDEX) and Irish- type or MVT Zn-Pb replacement deposits in carbonate rocks.  Intrusion related mineralization may include massive sulphide mantos, tungsten and base metal skarns, precious metal veins, sheeted veins and replacement deposits. The potential for intrusion related base and precious metal mineralization has been enhanced by the discovery of several previously unmapped intrusions.

Rock-Eval analyses for the Selwyn basin black shales indicate they are overmature with respect to the oil window; this thermal maturity is consistent with the overall lower greenschist facies metamorphism and incipient to pervasive deformation fabric.

View the bedrock geology map

For more information: Patrick Sack